User Guide

Issue 1 04/2005 COMPANY CONFIDENTIAL 21
Copyright © 2005 Nokia. All Rights Reserved.
RM-94
6(b) - RF Troubleshooting Nokia Customer Care
GMSK
Use Phoenix to select
TX_Data Type: Random
TX Power Level: 10
Ch37
Ensure Vbatt=3.6 V
Yes
Oscilloscope
C7711 Mode V = 0 Volt
R7511
VREF01
Vdc = 1.35 Volt Check
C7512
VR2
Vdc = 2.78 Volt No Baseband
TXP testpoint
TXP
V = 1.8 Volt
C7517
VR5
Vdc = 2.78 Volt
R7516
VR3
Vdc = 2.78 Volt
Yes
Oscilloscope
C7529
TXIOUTP
67kHz
Vac = 0.45 Vpp, Vdc =
1.2 V
No Check
C7529
TXIOUTN
67kHz
Vac = 0.45 Vpp, Vdc =
1.2 V
Baseband
C7530
TXQOUTP
67kHz
Vac = 0.45 Vpp, Vdc =
1.2 V
C7530
TXQOUTN
67kHz
Vac = 0.45 Vpp, Vdc =
1.2 V
Yes
Oscilloscope
C7701
VTXB_900
V = 2.78 Volt No Check:
VC1
CONT1
V = 0 Volt Helgo Serial Interface
VC2
CONT2
V = 0 Volt Helgo
VC3
CONT3
V = 2.7 Volt
R7713
VPCTRL_90
0
V = 1.17 Volt
Yes
Spectrum analyzer No Check
Z7700 out, R7704 in RFin_850/
900
P>= 2 dBm, 897.4MHz EGSM TX SAW Filter
Compare with good
sample
Helgo
Yes Synthesizer
Spectrum analyzer Check PA N7700
Z7800 TX1 (PA N7700
RFOut_850/900)
No Check Power Loop
(TXC, Vpctrl900, DET)
Power = +24.3 dBm,
897.4 MHz
Yes
Spectrum analyzer Check
RF@Test-Jig No
Pout
= +23 dBm, 897.4 MHz
Antenna Switch (Z7800)
Yes
GSM900 TX
OK